Device for multiplying speed of shafts



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J MILLER. DEVICE FOR MULTIPLYING SPEED OF SHAFTS- Patented Mar. 27 1888.

WITNESSES,

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' (No Model 2 Sheets-Shet 2 DEVICE FOR MULTIPLY-ING SPEED OF SHAEIS Q Y ll m Patented M WITNESSES, Fair-0X70 11 3 6606 UNITED STATES PATENT OFF-1a.- v

MARSHALL J. MILLER, OF MEMPHIS, TENNESSEE.

DEVICE FOR MULTIPLYING SPEED, OF SHAFTS.

SPECIFICATION forming part of Letters Patent No. 379,971, dated March 27, 1888.

Application filed May 10, 1887. Serial No. 237.710. No model.)

To aZZ. whom it may concern;

Be it known that I, MARSHALL J. MILLER, acitizen of the United States, residing at Memphis, in the county of Shelby and State of Ten- 5 nessee, have invented certain new and useful Improvem'entsin Devices for Multiplying and Governing the Speed of Shafts; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which 1 it appertains to make and use the same.

This invention relates to that class of multiplying apparatus or gearing which embodies the principle of the trammel, in which a disk is provided with slots crossing each other and a beam or pitman carries lateralpins which slide in said slots.

The object of my invention is to provide a simple and improved gearing of this class for effecting a double revolution of one section of the shaft by each single revolution of another section, which will effectively operate to secure economy in fuel and power, and which will furthermore possess advantages in point of inexpensiveness and durabilityin construction and effectiveness and general efficiency in operation.

Myinvention comprises the details in the construction and arrangement of parts, substantially as will be hereinafter fully set forth, and specifically pointed out in the claim.

In the accompanying drawings I have shown my improved gearing in connection with a propeller-shaft for steamships, and the description refers to my improved gearing in this connection; but it is manifest that the same is adapted for application and use in connection with all kinds and sizes of shafts, and that it is adapted for special application and efficient o operation in steam-launches and for multiplying the speed of small shafting and obviating the employment of belting and other devices of this character.

In the drawings, Figure 1 is a perspective view of a section of shafting embodying my improvements. Fig. 2 is a longitudinal sectional view taken through the same. Fig. 3 is a detail front elevation of the slotted disk. Fig. 4 is a transverse detail sectional view taken on the line a: as, Fig. 2. Fig. 5 is a de tail cross-section taken through the disk on the line yy, Fig. 3. Fig. 6 is a front elevation,

on a smaller scale,illustrating a modified construction adapted to be employed in lieu of thedisk. i

Corresponding parts in the figures are denoted by the same letters of reference.

Referring to the drawings, A designates the main section of the shaft, the section being mounted in suitable bearings, a, and provided upon its end with a crank-arm, A, by which motion may be communicated from the driverod of an engine.

B designates an adjoining separate section of the shaft, which is mounted in suitablebear- 6' ings, b, and carries at its end a propeller, B. Thesection B is adapted to receive its motion from the main section carrying the disk by means of theimproved gearing, and is mounted in its bearings, so that its longitudinal plane will be lower than the longitudinal plane of the main section A and thus bring the end of the section B at one side the center of the disk, as shown.

, .Upon the end of the section A is mounted a disk, 0, provided with slots a, crossing each other at right angles, as clearly illustrated in Fig. 3. This disk is constructed, as herein illustrated, with the slots extending entirely through, a supplementary disk or plate, 0, being bolted. or otherwise secured upon the corresponding rear face of the disk proper. The inner opposite faces of the slots 0 are provided with bearing-surfaces formed of steel bars or plates D, dovetailed, as shown at d, or otherwise secured in position in the disk.

Upon the end of the section B adjoining the disk is provided a transverse arm or crosspiece, E, having at each end a laterally-projecting pin, E, by which arrangement the said pins are located at diametrically-opposite sides of the section B, while the disk is centrally mounted upon the end of section A.

The pins are preferably constructed with shoulders e, from which project their portions 0 which enter the slots.

The operation and advantages'of this class of devices for multiplying the speed of shafts will be readily understood by those skilled in the art to which it appertains. By the arrangement of the slotted disk centrally upon the main section A and the location of the sec tionB in a different longitudinal plane,so that its end carrying the pins at diametrically-opposite sides will be at one side the center of the disk, 2. double revolution of the section B is effected by each single revolution of the section A. It will be understood that the pins move in their respective slots 0 during the revolution of the disk, and that motion is communicated with the section B by the revolutions of the disk acting through its arrangement of slots crossing each other at right angles upon the pins on diametrically-opposite sides of the end of section B.

In the modification illustrated in Fig. 6 the disk is formed by a series of four radial arms, 0, provided with corresponding slots, 0, and bearing-surfaces D, and having a corresponding backing-plate, 0 this construction being preferred in the application of my improved gearing for certain purposes.

Itis manifest that modifications may be made in the details of construction as herein illusscope of my invention.

trated without departing from the spirit and For instance, an arrangement of set or temper screws may be provided for adjusting the plates D, forming the bearing-surfaces, and for taking up wear in the same, and any desired number of sections may be embodied in a single shaft and provided at each joint with myimproved multiplying gearing.

I claim as my invention- In a device of the class described for multiplying the speed of shafts, the improved disk comprising the main portion provided with slots crossing each other at right angles and extending entirely through said portion, the correspondingsupplementary portion or backing-plate bolted or otherwise secured upon the rear face of the main portion, and the bars or plates secured in the disk and having bearingsurfaces projecting from the inner opposite faces of the slots, substantially as set forth.

In testimony whereofI aflix my signature in presence of two witnesses.

MARSHALL J. MILLER.

\Vitnesses:

PHILIP B. J ONES, HARRY E. AVERY. 

